Along the straight road

I need help in the below problem.
Thanks

Quote:

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Originally Posted by kingman

I need help in the below problem.
Thanks

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1. Let r denote the distance XA and s the distance BY. Use the definition of speed: $\displaystyle speed = \frac{distance}{time}~\implies~ time = \frac{distance}{speed}$

2. You can extract a system of simultaneous equations from the text:

$\displaystyle \frac r4 = \frac{s+120}6~\wedge~\frac{r+120}6=\frac s4$

Solve for r and s.

Cannot read your answer . Sorry

what is the significance of 120m